Question

a cyclist travelling at 15m/s.she applies brake so that she does not collide with a wall 18m away.what is the deceleration must she have?​

Answer 1

Answer:

Cycle comes to rest, so v = 0

v^2 = u^2 + 2as

0 = 15^2 + 2 × a × 18

0 = 225 + 36a

a = -225 ÷ 36

a = -6.25 m/s^2